JPS644899B2 - - Google Patents

Info

Publication number
JPS644899B2
JPS644899B2 JP56109664A JP10966481A JPS644899B2 JP S644899 B2 JPS644899 B2 JP S644899B2 JP 56109664 A JP56109664 A JP 56109664A JP 10966481 A JP10966481 A JP 10966481A JP S644899 B2 JPS644899 B2 JP S644899B2
Authority
JP
Japan
Prior art keywords
screw
cold extruder
extruder
speed
cold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP56109664A
Other languages
Japanese (ja)
Other versions
JPS5811129A (en
Inventor
Masakazu Sugimoto
Shuji Kuhara
Takeshi Kusaba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP56109664A priority Critical patent/JPS5811129A/en
Priority to US06/396,341 priority patent/US4470937A/en
Publication of JPS5811129A publication Critical patent/JPS5811129A/en
Publication of JPS644899B2 publication Critical patent/JPS644899B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/05—Filamentary, e.g. strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/92409—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92933—Conveying, transporting or storage of articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92942—Moulded article

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 本発明はあらかじめ熱入れされることなしにゴ
ム等の材料が供給されるコールド押出機におい
て、このコールド押出機により押出される成形品
を一定の寸法に制御することの出来る制御機構を
備えた押出機に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold extruder in which materials such as rubber are supplied without being heated in advance, and a method for controlling molded products extruded by the cold extruder to constant dimensions. The invention relates to an extruder equipped with a control mechanism that can be used.

従来からコールド押出機により押出された成形
品の寸法が精度よく一定とならないことが成形品
製造上の問題点となつていた。これに対し、従来
よりコールド押出機の口金（出口）に圧力センサ
ーを設け、この圧力センサーによりこの押出機の
スクリユーにより圧力がかけられた材料の圧力を
検出することでコールド押出機のスクリユー回転
数を制御して成形品の寸法を一定に保とうとする
試みがなされたが、押出される成形品の品種ごと
に口金を取り替える必要があり、作業性がきわめ
て悪いものであつた。さらに口金に圧力センサー
を取付けたとしても、圧力センサーがゴムの出口
圧力を正確に表わしていないなどの理由から、圧
力センサーによるコールド押出機スクリユー回転
数の制御によつて成形品の寸法を一定にすること
は困難であつた。 BACKGROUND ART Conventionally, it has been a problem in manufacturing molded products that the dimensions of molded products extruded by a cold extruder are not constant with high precision. In contrast, conventionally, a pressure sensor is installed at the mouth (outlet) of the cold extruder, and this pressure sensor detects the pressure of the material that is pressurized by the screw of the extruder, thereby increasing the screw rotation speed of the cold extruder. Attempts have been made to keep the dimensions of the molded product constant by controlling the extrusion, but this requires changing the die for each type of molded product to be extruded, resulting in extremely poor workability. Furthermore, even if a pressure sensor is attached to the mouthpiece, the pressure sensor does not accurately represent the exit pressure of the rubber, so the dimensions of the molded product are kept constant by controlling the screw rotation speed of the cold extruder using the pressure sensor. It was difficult to do so.

本願の発明者は研究の結果、コールド押出機に
より製造される成形品の寸法が変動する理由は次
の点にあることを究明した。すなわち、材料が時
間に関し一定の割合でコールド押出機に供給され
たとしても、押出された成形品の寸法が一定とな
らないのはコールド押出機の投入口に供給された
材料の一部が円滑にスクリユーによつて押出され
ないで、材料投入口付近で停滞して材料の停滞す
なわち塊（以下バンクという）ができ、このバン
クが成長して大きくなると後に供給されて来る材
料が円滑にスクリユーによつて押出されるのを防
げる働きをし、出口からの吐出量が減少すること
によるのである。さらに本願の発明者は、コール
ド押出機の材料投入口付近に生じたバンクの存在
は、コールド押出機のスクリユー回転数を一定に
した場合、コールド押出機の負荷電流に変動を生
ずることを知見し、この負荷電流の変動を調べる
ことによりバンクが検出されることを発見した。 As a result of research, the inventor of the present application found that the reason why the dimensions of molded products manufactured by a cold extruder vary is as follows. In other words, even if the material is fed to the cold extruder at a constant rate over time, the dimensions of the extruded molded product will not be constant because some of the material fed to the input port of the cold extruder is not smoothly fed into the cold extruder. Instead of being pushed out by the screw, the material stagnates near the material input port, creating a stagnation or lump (hereinafter referred to as a bank) of the material, and as this bank grows and becomes larger, the material that is later supplied can be smoothly moved by the screw. This is because it works to prevent the material from being extruded and reduces the amount of fluid discharged from the outlet. Furthermore, the inventor of the present application found that the presence of a bank near the material input port of a cold extruder causes fluctuations in the load current of the cold extruder when the screw rotation speed of the cold extruder is kept constant. They discovered that banks can be detected by examining the fluctuations in this load current.

本発明の目的は、コールド押出機によつて製造
される成形品の寸法を精度よく一定に保つことの
出来る制御機構を備えた押出機を提供することに
ある。本発明の制御機構を備えた押出機は、電動
モータにより駆動されるスクリユーの回転数をあ
らかじめ所定の値に設定したコールド押出機と、
このコールド押出機の出口付近に配置され、押出
された成形品を前記スクリユーの回転数に対応し
た速度で移動するベルト上に乗せて引き出す引出
しコンベアーと、このコールド押出機のモータ負
荷電流を検出する電流検出機と、この電流検出器
から出力されたモータ負荷電流を表す信号を入力
し、モータ負荷電流の変動に基づいてコールド押
出機内の材料の停滞の存否を推定し、材料の停滞
が存在すると推定された場合、前記所定の値に設
定されているコールド押出機のスクリユーの回転
数を増加させる信号とこれに対応する引出しコン
ベアーの速度を指示する信号とをコールド押出機
および引出しコンベアーのそれぞれに出力し、材
料の停滞の消失が推定された場合、前記所定の値
にスクリユーの回転数を設定する信号およびそれ
に対応する引出しコンベアーの速度を指示する信
号とをコールド押出機および引出しコンベアーの
それぞれに出力する制御機構と、を有する。 SUMMARY OF THE INVENTION An object of the present invention is to provide an extruder equipped with a control mechanism that can keep the dimensions of molded products manufactured by a cold extruder constant with high precision. An extruder equipped with the control mechanism of the present invention includes a cold extruder in which the rotational speed of a screw driven by an electric motor is set to a predetermined value in advance;
A drawer conveyor is placed near the exit of the cold extruder and extracts the extruded molded product on a belt that moves at a speed corresponding to the rotation speed of the screw, and the motor load current of the cold extruder is detected. Input a current detector and a signal representing the motor load current output from this current detector, estimate whether there is material stagnation in the cold extruder based on fluctuations in the motor load current, and determine if material stagnation exists. If it is estimated, a signal for increasing the rotational speed of the screw of the cold extruder set to the predetermined value and a corresponding signal for instructing the speed of the drawer conveyor are sent to each of the cold extruder and the drawer conveyor. a signal for setting the rotational speed of the screw to the predetermined value and a corresponding signal for instructing the speed of the drawer conveyor to each of the cold extruder and the drawer conveyor when the material stagnation is estimated to have disappeared; and a control mechanism for outputting the output.

以下、この発明を図面に基づいて説明する。 The present invention will be explained below based on the drawings.

第１，２図は、この発明の一実施例を示す図で
ある。まず構成を説明する。１は制御機構２を備
えたコールド押出機であり、コールド押出機１は
シリンダ３の内部にスクリユー４が回転自在に挿
入されていて、スクリユー４は電動モータ５によ
りあらかじめ設定された所定の値の回転数で駆動
されるようになつている。コールド押出機１は、
また、材料投入口としてのホツパー部６、ヘツド
７および口金８を有し、ホツパー部６からシリン
ダ３内にあらかじめ熱入れされることなく投入さ
れるフイードゴム等の材料を、スクリユー４でシ
リンダ３内をヘツド７方向に押込み口金８より所
定の寸法形状の成形品９として押出すものであ
る。 1 and 2 are diagrams showing an embodiment of the present invention. First, the configuration will be explained. 1 is a cold extruder equipped with a control mechanism 2; in the cold extruder 1, a screw 4 is rotatably inserted into a cylinder 3; It is designed to be driven by rotational speed. The cold extruder 1 is
It also has a hopper part 6, a head 7, and a mouthpiece 8 as a material input port, and the material such as feed rubber that is thrown into the cylinder 3 from the hopper part 6 without being heated in advance is fed into the cylinder 3 by a screw 4. The molded product 9 having a predetermined size and shape is extruded from the pusher die 8 in the direction of the head 7.

１０は引出しコンベアーであり、ベルト１１を
コールド押出機１のスクリユー４の回転数に対応
した速度で移動するようモータ１２で駆動し、口
金８より押し出された成形品９をベルト１１上に
乗せて搬出するものである。 Reference numeral 10 denotes a drawer conveyor, which is driven by a motor 12 to move a belt 11 at a speed corresponding to the rotation speed of the screw 4 of the cold extruder 1, and places the molded product 9 extruded from the die 8 on the belt 11. It is to be carried out.

１３は電流検出器であり、コールド押出機１の
スクリユー４を駆動する電動モータ５の負荷電流
を検出する。 A current detector 13 detects the load current of the electric motor 5 that drives the screw 4 of the cold extruder 1.

２は制御機構であり、電流検出機１３で検出さ
れた負荷電流の変動をそのσを計算することによ
り求めるσ計算回路１４と、このσ計算回路１４
で求められたσと基準値σ0とを比較する比較器１
５と、比較器１５の出力を受けてスクリユー４の
回転数を制御する回転数制御回路１６と、スクリ
ユー４の回転数に対応するよう引出しコンベアー
１０のベルト１１の速度を制御する速度制御回路
１７とを有する。 Reference numeral 2 denotes a control mechanism, which includes a σ calculation circuit 14 that calculates the fluctuation of the load current detected by the current detector 13 by calculating its σ, and this σ calculation circuit 14.
Comparator 1 that compares σ obtained by and the reference value σ 0
5, a rotation speed control circuit 16 that controls the rotation speed of the screw 4 in response to the output of the comparator 15, and a speed control circuit 17 that controls the speed of the belt 11 of the drawer conveyor 10 to correspond to the rotation speed of the screw 4. and has.

次に作用を説明する。 Next, the effect will be explained.

あらかじめ押出機１のスクリユー４は、所定の
値の回転数でモータ５により駆動されるよう回転
数制御回路１６で設定されており、ホツパー部６
から時間的に一定の量で供給されあらかじめ熱入
れされることなく投入されるフイードゴムをヘツ
ド７の方向に押込み、口金８より所定の寸法形状
に押出成型する。口金８より押出された成形品９
はスクリユー４の回転数すなわち成形品９が口金
８から押出される速度に対応した速度で移動する
ベルト１１上に乗せられて引き出される。 The screw 4 of the extruder 1 is set in advance by the rotation speed control circuit 16 so as to be driven by the motor 5 at a predetermined value of rotation speed, and the screw 4 of the extruder 1 is set in advance by the rotation speed control circuit 16 so that the screw 4
Feed rubber, which is supplied in a constant amount over time and is thrown in without being heated beforehand, is pushed in the direction of the head 7 and extruded from the mouthpiece 8 into a predetermined size and shape. Molded product 9 extruded from die 8
is placed on a belt 11 that moves at a speed corresponding to the rotational speed of the screw 4, that is, the speed at which the molded product 9 is extruded from the die 8, and is pulled out.

今、ホツパー部６付近でフイードゴムの塊すな
わちバンク１８ができ、これが大きく成長する
と、スクリユー４を所定の値で回転駆動している
モータ５の負荷電流に変動が生ずる。すなわち、
バンク１８が生じていない場合のモータ５の負荷
電流はほぼ所定の基準値I0の付近にあるが、バン
ク１８が生じた場合のモータ５の負荷電流Ｉは前
述の所定の基準値より大きくなつたり小さくなつ
たりして基準値I0中心に上下に変動する。このモ
ータ５の負荷電流Ｉを電流検出機１３で検出し、
負荷電流の変動をσ計算回路１４で、一定時間内
のσ＝∫（Ｉ−I0）2dtとして算出し、比較器１５
で基準値σ0と比較し、もし、基準値σ0より大きけ
れば、バンク１８が存在すると推定し、回転数制
御回路１６によりスクリユー４の回転数を一定の
時間率で微増させる信号をモータ５に出力し、同
時に、速度制御回路１７によりスクリユー４の回
転数の微増に対応するようにベルト１１の速度を
微増させる信号をモータ１２に出力する。このよ
うにスクリユー４の回転数を増加させるとホツパ
ー部のバンク１８は減少し、フイードゴムはホツ
パー部６に円滑に供給され、口金８より押出され
る成形品９の寸法形状の変動は最小限にとどめら
れる。バンク１８がこのようにして消滅すると、
その時のモータ負荷電流I′はその時の設定モータ
回転数に対応した基準電流I0′付近に落ち着き変
動しなくなる。したがつて、σ計算回路１４が算
出する一定時間内のσ′＝∫（Ｉ−I0′）2dtの値は比
較器１５で比較される基準値σ0より小さくなり、
比較器１５はバンク１８の消滅を推定する。する
と、回転数制御回路１６はスクリユー４の回転数
を一定時間率で微減させ、あらかじめ設定された
所定の値に戻す。速度制御回路１７はこのスクリ
ユー４の回転数の微減に対応するようベルト１１
の速度を微減させる信号をモータ１２に出力す
る。このようにしてコールド押出機１はバンク１
８が発生する前の状態に復帰し、口金８より押出
される成形品９を所定の寸法形状に保つ。 Now, a lump of feed rubber, ie, a bank 18, is formed near the hopper portion 6, and when this grows large, a fluctuation occurs in the load current of the motor 5, which rotates the screw 4 at a predetermined value. That is,
The load current of the motor 5 when the bank 18 does not occur is approximately around the predetermined reference value I0 , but the load current I of the motor 5 when the bank 18 occurs becomes larger than the above-mentioned predetermined reference value. It fluctuates up and down around the reference value I0 as the value increases and decreases. This load current I of the motor 5 is detected by a current detector 13,
The fluctuation in the load current is calculated by the σ calculation circuit 14 as σ=∫(I-I 0 ) 2 dt within a certain period of time, and the comparator 15
is compared with the reference value σ 0 , and if it is larger than the reference value σ 0 , it is estimated that the bank 18 exists, and the rotation speed control circuit 16 sends a signal to the motor 5 to slightly increase the rotation speed of the screw 4 at a constant time rate. At the same time, the speed control circuit 17 outputs a signal to the motor 12 to slightly increase the speed of the belt 11 in response to a slight increase in the rotational speed of the screw 4. When the rotational speed of the screw 4 is increased in this way, the bank 18 in the hopper section is reduced, feed rubber is smoothly supplied to the hopper section 6, and variations in the dimensions and shape of the molded product 9 extruded from the die 8 are minimized. It can be stopped. When bank 18 disappears in this way,
The motor load current I' at that time settles around the reference current I 0 ' corresponding to the set motor rotation speed at that time and does not fluctuate. Therefore, the value of σ'=∫(I-I 0 ') 2 dt within a certain period of time calculated by the σ calculation circuit 14 is smaller than the reference value σ 0 compared with the comparator 15,
Comparator 15 estimates the disappearance of bank 18. Then, the rotational speed control circuit 16 slightly decreases the rotational speed of the screw 4 at a fixed time rate to return it to a predetermined value. The speed control circuit 17 controls the belt 11 so as to correspond to the slight decrease in the rotational speed of the screw 4.
A signal is output to the motor 12 to slightly reduce the speed of the motor. In this way, cold extruder 1 is connected to bank 1
8 returns to the state before occurrence, and the molded product 9 extruded from the die 8 is maintained at a predetermined size and shape.

なお、上述の実施例は負荷電流の変動を検出す
るため、σを計算したが、これに変え、たとえば
負荷電流の振幅を検出するようにしてもよい。 In the above-described embodiment, σ was calculated in order to detect fluctuations in the load current, but instead of this, for example, the amplitude of the load current may be detected.

以上説明したように、この発明によれば電動モ
ータにより駆動されるスクリユーの回転数をあら
かじめ所定の値に設定したコールド押出機と、こ
のコールド押出機の出口付近に配置され、押出さ
れた成形品を前記スクリユーの回転数に対応した
速度で移動するベルト上に乗せて引き出す引出し
コンベアーと、このコールド押出機のモータ負荷
電流を検出する電流検出機と、この電流検出機か
ら出力されたモータ負荷電流を表す信号を入力
し、モータ負荷電流の変動に基づいてコールド押
出機内の材料の停滞の存否を推定し、材料の停滞
が存在すると推定された場合、前記所定の値に設
定されているコールド押出機のスクリユーの回転
数を増加させる信号とこれに対応する引出しコン
ベアーの速度を指示する信号とをコールド押出機
および引出しコンベアーそれぞれに出力し、材料
の停滞の消失が推定された場合、前記所定の値に
スクリユーの回転数を設定する信号およびそれに
対応する引出しコンベアーの速度を指示する信号
とをコールド押出機および引出しコンベアーのそ
れぞれに出力する制御機構と、を有することを特
徴とする制御機構を備えた押出機としたため、成
形品の寸法形状の変動を最小限にとどめることが
でき、均一な寸法形状を有する成形品を得ること
ができるという効果がある。 As explained above, according to the present invention, there is provided a cold extruder in which the rotational speed of a screw driven by an electric motor is set to a predetermined value in advance, and a molded product disposed near the exit of the cold extruder to extrude the molded product. a drawer conveyor that pulls out the cold extruder by placing it on a belt that moves at a speed corresponding to the rotational speed of the screw, a current detector that detects the motor load current of this cold extruder, and a motor load current output from this current detector. The presence or absence of material stagnation in the cold extruder is estimated based on the fluctuation of the motor load current, and if it is estimated that material stagnation exists, the cold extruder is set to the predetermined value. A signal to increase the rotational speed of the screw of the machine and a corresponding signal instructing the speed of the drawer conveyor are output to each of the cold extruder and the drawer conveyor, and when it is estimated that material stagnation has disappeared, the predetermined A control mechanism that outputs a signal for setting the rotational speed of the screw to a value and a signal instructing the speed of the drawer conveyor corresponding thereto to each of the cold extruder and the drawer conveyor. Since the extruder was used as an extruder, variations in the dimensions and shape of the molded product can be kept to a minimum, and molded products having uniform dimensions and shape can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

添附図面はこの発明の一実施例にかかる制御機
構を備えた押出機の要部を示す概略図である。 １……コールド押出機、２……制御機構、４…
…スクリユー、５……電動モータ、８……口金、
９……成形品、１０……引出しコンベアー、１１
……ベルト、１２……モータ、１３……電流検出
機、４……σ計算回路、１５……比較器、１６…
…回転数制御回路、１７……速度制御回路、１８
……バンク。 The accompanying drawing is a schematic diagram showing the main parts of an extruder equipped with a control mechanism according to an embodiment of the present invention. 1...cold extruder, 2...control mechanism, 4...
... Screw, 5 ... Electric motor, 8 ... Base,
9... Molded product, 10... Drawer conveyor, 11
... Belt, 12 ... Motor, 13 ... Current detector, 4 ... σ calculation circuit, 15 ... Comparator, 16 ...
...Rotation speed control circuit, 17...Speed control circuit, 18
……bank.

Claims (1)

【特許請求の範囲】[Claims] １ 電動モータにより駆動されるスクリユーの回
転数をあらかじめ所定の値に設定したコールド押
出機と、このコールド押出機の出口付近に配置さ
れ、押出された成形品を前記スクリユーの回転数
に対応した速度で移動するベルト上に乗せて引き
出す引き出しコンベアーと、このコールド押出機
のモータ負荷電流を検出する電流検出機と、この
電流検出機から出力されたモータ負荷電流を表す
信号を入力し、モータ負荷電流の変動に基づいて
コールド押出機内の材料の停滞の存否を推定し、
材料の停滞が存在すると推定された場合、前記所
定の値に設定されているコールド押出機のスクリ
ユーの回転数を増加させる信号とこれに対応する
引出しコンベアーの速度を指示する信号とをコー
ルド押出機および引出しコンベアーのそれぞれに
出力し、材料の停滞の消失が推定された場合、前
記所定の値にスクリユーの回転数を設定する信号
およびそれに対応する引出しコンベアーの速度を
指示する信号とをコールド押出機および引出しコ
ンベアーのそれぞれに出力する制御機構と、を有
することを特徴とする制御機構を備えた押出機。1 A cold extruder in which the rotational speed of a screw driven by an electric motor is set to a predetermined value in advance, and a cold extruder placed near the exit of this cold extruder to extrude the molded product at a speed corresponding to the rotational speed of the screw. A drawer conveyor that is placed on a moving belt and pulled out, a current detector that detects the motor load current of this cold extruder, and a signal representing the motor load current output from this current detector is input, and the motor load current is Estimate the presence or absence of material stagnation in the cold extruder based on the fluctuation of
If material stagnation is estimated to exist, a signal is sent to the cold extruder to increase the rotational speed of the screw of the cold extruder, which is set to the predetermined value, and a corresponding signal to instruct the speed of the drawer conveyor. and the cold extruder with a signal to set the screw rotation speed to a predetermined value and a corresponding signal instructing the speed of the drawer conveyor, respectively, when the disappearance of material stagnation is estimated. and a control mechanism for outputting to each of the drawer conveyors.
JP56109664A 1981-07-14 1981-07-14 Extruder provided with control system Granted JPS5811129A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56109664A JPS5811129A (en) 1981-07-14 1981-07-14 Extruder provided with control system
US06/396,341 US4470937A (en) 1981-07-14 1982-07-08 Size control of extrusion molded articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56109664A JPS5811129A (en) 1981-07-14 1981-07-14 Extruder provided with control system

Publications (2)

Publication Number Publication Date
JPS5811129A JPS5811129A (en) 1983-01-21
JPS644899B2 true JPS644899B2 (en) 1989-01-27

Family

ID=14516029

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56109664A Granted JPS5811129A (en) 1981-07-14 1981-07-14 Extruder provided with control system

Country Status (2)

Country Link
US (1) US4470937A (en)
JP (1) JPS5811129A (en)

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JPH03213698A (en) * 1990-01-17 1991-09-19 Toshiba Electric Appliance Co Ltd Electric fan

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DE3526050C2 (en) * 1985-07-20 1994-11-17 Krupp Ag Hoesch Krupp Process for operating an extruder
DE3545747C2 (en) * 1985-12-21 1994-10-06 Krupp Ag Hoesch Krupp Extruder monitoring
JPH02106316A (en) * 1988-10-14 1990-04-18 Risuron:Kk Manufacture of floor mat
DE3902405C1 (en) * 1989-01-27 1990-03-08 Paul Troester Maschinenfabrik, 3000 Hannover, De
GB2237239B (en) * 1989-10-27 1993-09-01 Reifenhaeuser Masch A process for the production of a ribbon of synthetic thermoplastic material in sheet form
US6113841A (en) 1998-11-17 2000-09-05 Pechiney Plastic Packaging, Inc. Multiple in-line parison control
CN103273638A (en) * 2013-05-24 2013-09-04 广东联塑机器制造有限公司 Method and device for controlling conical twin-screw extruder
WO2020237144A1 (en) * 2019-05-23 2020-11-26 General Electric Company Additive manufacturing recoat assemblies including sensors and methods for using the same

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US2916792A (en) * 1957-09-24 1959-12-15 Colgate Palmolive Co Apparatus for and method of controlling the rate of extrusion of a plastic material of varying workability
US3148231A (en) * 1961-03-20 1964-09-08 Eastman Kodak Co Plastic extrusion, apparatus and control
US3904338A (en) * 1972-01-31 1975-09-09 Industrial Nucleonics Corp System and method for controlling a machine continuously feeding a sheet to intermittently activated station
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03213698A (en) * 1990-01-17 1991-09-19 Toshiba Electric Appliance Co Ltd Electric fan

Also Published As

Publication number Publication date
US4470937A (en) 1984-09-11
JPS5811129A (en) 1983-01-21

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